How to count number of ones and zeros in a binary number?

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ASHA PON 2022-11-29

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评论： ASHA PON 2022-11-29

I am having some set of binary numbers. I need to count the number of ones and zeros in each binary number. If a binary number has even number of ones then the output has to be '1' or it has to be '0'. Thank you in advance.

Example:

A=1100

B=0100

output of A =1

output of B = 0

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Davide Masiello 2022-11-29

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编辑：Davide Masiello 2022-11-29

在 MATLAB Online 中打开

I will assume that your binary numbers are stored as a character array, which is how Matlab normally works, e.g.

A = dec2bin(20)
A = '10100'
B = dec2bin(21)
B = '10101'

Now in the example above, A has an even and B has an odd number of ones respectively.

your desired output can be easily obtained with

1-mod(nnz(A=='1'),2)
ans = 1
1-mod(nnz(B=='1'),2)
ans = 0

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Davide Masiello 2022-11-29

在 MATLAB Online 中打开

A= [1110, 0111, 0110, 1111];
B = 1-mod(sum(num2str(A') == '1',2),2)
B = 4×1
     0
     0
     1
     1

ASHA PON 2022-11-29

Thank you for the reply. This is what i needed.

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Chunru 2022-11-29

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在 MATLAB Online 中打开

% if you use char to represent binary numbers
A='1100';
mod(sum(A=='1'), 2) == 0
ans = logical
   1
% if you use double to represent binaray numbers, you can do the conversion
% first
A = 1100;
A = num2str(A)
A = '1100'
mod(sum(A=='1'), 2) == 0
ans = logical
   1